DevOps - Lab 9: Installing and Configuring PNP4Nagios

Download

Installing and Configuring PNP4Nagios

In Lab 9: Installing and Configuring PNP4Nagios, participants typically focus on extending the monitoring capabilities of Nagios by installing and configuring the PNP4Nagios plugin. PNP4Nagios is designed to enhance Nagios with performance data visualization and graphing capabilities. This lab involves the installation of PNP4Nagios components, configuration of the Nagios integration, and exploration of the web interface for graphing and analyzing performance metrics. Participants may also learn to customize and fine-tune graphing options to meet specific monitoring requirements. The lab aims to provide hands-on experience in extending Nagios functionalities, enabling participants to visualize and analyze performance data effectively. Successful completion of Lab 9 equips participants with the skills to enhance their Nagios monitoring setup with advanced graphing capabilities using PNP4Nagios.

Lab:

Step 1: installing and configuring PNP4Nagios

yum install rrdtool
yum install ruby xorg-x11-fonts-Type1 php-xml

Step 2: Downloading PNP4Nagios

cd /tmp/
wget https://sourceforge.net/projects/pnp4nagios/files/PNP-0.6/pnp4nagios-0.6.25.tar.gz
tar -xvf pnp4nagios-0.6.25.tar.gz
cd pnp4nagios-0.6.25
./configure --with-rrdtool=/usr/bin/rrdtool --with-nagios-user=nagios --with-nagios-group=nagcmd
make all
make install-webconf
make install-config
make install-init
make fullinstall

Step 3: Start and Enable web & nagios service

systemctl enable npcd
systemctl start npcd
systemctl restart nagios
systemctl restart httpd

Step 4: Verify PNP4Nagios configuration

cd scripts
./verify\_pnp\_config\_v2.pl -m bulk -c /usr/local/nagios/etc/nagios.cfg -p /usr/local/pnp4nagios/etc/

Step 5: Edit vi /usr/local/nagios/etc/nagios.cfg file add add below lines at the end

\# service performance data
#
service\_perfdata\_file=/usr/local/pnp4nagios/var/service-perfdata
service\_perfdata\_file\_template=DATATYPE::SERVICEPERFDATA\\tTIMET::$TIMET$\\tHOSTNAME::$HOSTNAME$\\tSERVICEDESC::$SERVICEDESC$\\tSERVICEPERFDATA::$SERVICEPERFDATA$\\tSERVICECHECKCOMMAND::$SERVICECHECKCOMMAND$\\tHOSTSTATE::$HOSTSTATE$\\tHOSTSTATETYPE::$HOSTSTATETYPE$\\tSERVICESTATE::$SERVICESTATE$\\tSERVICESTATETYPE::$SERVICESTATETYPE$
service\_perfdata\_file\_mode=a
service\_perfdata\_file\_processing\_interval=15
service\_perfdata\_file\_processing\_command=process-service-perfdata-file

#
# host performance data starting with Nagios 3.0
#
host\_perfdata\_file=/usr/local/pnp4nagios/var/host-perfdata
host\_perfdata\_file\_template=DATATYPE::HOSTPERFDATA\\tTIMET::$TIMET$\\tHOSTNAME::$HOSTNAME$\\tHOSTPERFDATA::$HOSTPERFDATA$\\tHOSTCHECKCOMMAND::$HOSTCHECKCOMMAND$\\tHOSTSTATE::$HOSTSTATE$\\tHOSTSTATETYPE::$HOSTSTATETYPE$
host\_perfdata\_file\_mode=a
host\_perfdata\_file\_processing\_interval=15
host\_perfdata\_file\_processing\_command=process-host-perfdata-file\`

Step 6: Change below value from 0 to 1

process\_performance\_data=1
enable\_environment\_macros=1

Step 7: Error 1 – [CRIT] Command process-service-perfdata-file is not defined

vi /usr/local/nagios/etc/objects/commands.cfg

define command{
       command\_name    process-service-perfdata-file
       command\_line    /usr/local/pnp4nagios/libexec/process\_perfdata.pl --bulk=/usr/local/pnp4nagios/var/service-perfdata
}

define command{
       command\_name    process-host-perfdata-file
       command\_line    /usr/local/pnp4nagios/libexec/process\_perfdata.pl --bulk=/usr/local/pnp4nagios/var/host-perfdata
}

yum install php-xml

Step 8: Error 2 – sizeof(): Parameter must be an array or an object that implements Countable

vi /usr/local/pnp4nagios/share/application/models/data.php
Default line number: 979

Change from
if(sizeof($pages) > 0 ){

To
/\*if(sizeof($pages) > 0 ){\*/
   if(is\_array($pages)&&sizeof($pages) > 0){

systemctl restart httpd
systemctl restart nagios

Step 9: Error 3

Deprecated Methods v/ith the same name as the r class «ni not De constructors in a future version of PHP Servlces_JSON has a deprecated constructor ‘usr local pnp4nagios share applications ison.php on line 115 Deprecated Methods with the same name as the« class nH not be constructors in a future version of PHP Services_JSON_Error has a deprecated constructor in ‘usr>local’pnp4nagios>’share application/lib json.php on line 781 Deprecated Methods with the same name as the« class w not be constructors in a future version of PHP Services_JSON_Errot has a deprecated constructor in ‘usr’local’pnp4nagios’Share application/lib json.php on line 795

vi /usr/local/pnp4nagios/share/application/lib/json.php

From
class Services\_JSON
To
class \_Services\_JSON

From
class Services\_JSON\_Error extends PEAR\_Error
To
class \_Services\_JSON\_Error extends PEAR\_Error

From
class Services\_JSON\_Error
To
class \_Services\_JSON\_Error

rm -rf /usr/local/pnp4nagios/share/install.php

Step 10: Define a service to “ping” the local machine

vi /usr/local/nagios/etc/objects/localhost.cfg

define service {

    use                                                           local-service           ; Name of service template to use
    host\_name                                             localhost
    service\_description                              PING
    check\_command                                  check\_ping!100.0,20%!500.0,60%
    action\_url       /pnp4nagios/index.php/graph?host=$HOSTNAME$&srv=$SERVICEDESC$
}

systemctl restart httpd
systemctl restart nagios

Step 11: Open Browser